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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd473d3e859a5f8e93fd15d5baaca48964994791a8b3ffdb6a7d800a85309ada7' 
  AND token = 'g0TT6Rvv2hMx1KtMyh3j/+Tj4moK21oEaZvtPOG65cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}